Walls are pretty much everywhere. You could probably go your whole life without adding any walls to the world’s collection and things would be OK.
Windows are rarer. Creating a space in a wall for connecting with outsiders or communicating with strangers might leave the world in a poorer condition if it didn’t happen.
Doors are most valuable of all. Through a door, you can go out and discover your neighbors have needs that you can help with. You can invite them to your fire and to your table.
You can invite them to meet Jesus. Or, you could take Him out to visit them.
Do your walls have any holes?